What r the causes of dark yellow spots on teeth what is it?

Several: Staining, genetics, antibiotics. You can ask a dentist this question at your next visit as a visual inspection would make diagnosing this possible. Whitening may work ... If not, there is a way to remove the spots & cosmetically change the appearance of your teeth with lumineers or veneers or even crowns. See a dentist who is experienced & has cosmetic before and after photos to show you.

Possibly cavities: Option 1. Cavities can appear light yellow to dark yellow. It can also appear brown to black. The cause of this is the breakdown or decalcification of your teeth. Option 2: it could be your tooth development which would be genetic. Option 3: possibly staining from foods or drinks. If you really want an accurate answer to your situation, a dentist should take a look at it for an accurate diagnosis.

Fluorosis: The most common cause of dark yellow spots on teeth is fluorosis. If you grew up in an area where there were high levels of natural Fluoride in the water or you got overfluoridated as a child by accident to prevent cavities, the excess Fluoride stained your teeth. A trace of Fluoride in a child's diet creates healthy enamel. Too much Fluoride stains the teeth permanently.

Spots: Could be stained old fillings.

?: Your description cannot be diagnosed without medical, historical and visual examination.Please seek a doctor's help.

Stain: There are many reasons for stained teeth. Reason could be intrinsic (from within) or extrinsic(caused by food stain, etc. ) the first step is to be evaluated thoroughly by your dentist and then address and fix the problem.